The iPhone camera timer is a feature that allows you to take a photo after a set delay. This can be useful for taking self-portraits, group photos, or any other situation where you want to be in the photo yourself.
To use the timer, open the Camera app and tap the timer icon in the top right corner. You can then choose a delay of 3 or 10 seconds. Once you have selected a delay, tap the shutter button to start the timer. The phone will beep and take a photo after the delay has expired.